CA1084384A - Manual fluid pressure controller - Google Patents
Manual fluid pressure controllerInfo
- Publication number
- CA1084384A CA1084384A CA298,900A CA298900A CA1084384A CA 1084384 A CA1084384 A CA 1084384A CA 298900 A CA298900 A CA 298900A CA 1084384 A CA1084384 A CA 1084384A
- Authority
- CA
- Canada
- Prior art keywords
- cam
- handle
- housing
- fluid pressure
- metering piston
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D16/00—Control of fluid pressure
- G05D16/04—Control of fluid pressure without auxiliary power
- G05D16/10—Control of fluid pressure without auxiliary power the sensing element being a piston or plunger
- G05D16/107—Control of fluid pressure without auxiliary power the sensing element being a piston or plunger with a spring-loaded piston in combination with a spring-loaded slideable obturator that move together over range of motion during normal operation
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D16/00—Control of fluid pressure
- G05D16/04—Control of fluid pressure without auxiliary power
- G05D16/10—Control of fluid pressure without auxiliary power the sensing element being a piston or plunger
- G05D16/101—Control of fluid pressure without auxiliary power the sensing element being a piston or plunger the controller being arranged as a multiple-way valve
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T137/00—Fluid handling
- Y10T137/2496—Self-proportioning or correlating systems
- Y10T137/2559—Self-controlled branched flow systems
- Y10T137/2574—Bypass or relief controlled by main line fluid condition
- Y10T137/2605—Pressure responsive
- Y10T137/2607—With pressure reducing inlet valve
- Y10T137/261—Relief port through common sensing means
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T137/00—Fluid handling
- Y10T137/8593—Systems
- Y10T137/86919—Sequentially closing and opening alternately seating flow controllers
Landscapes
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Mechanically-Actuated Valves (AREA)
Abstract
MANUAL FLUID PRESSURE CONTROLLER
Abstract of the Disclosure A manual fluid pressure controller has a handle with integral cam which mates with a non-rotating cam follower. Rotation of the handle causes displacement of the cam follower which transmits a force through a metering spring to a metering piston. The metering piston actuates a combined inlet-exhaust valve to admit or exhaust fluid pressure to its one face until the spring force on its other side is balanced. The fluid pressure at the face of the metering piston is connected to the load whose pressure it is desired to control.
A cam stop, integral with the cam follower cooperates with a matching stop on the handle to limit handle travel.
Abstract of the Disclosure A manual fluid pressure controller has a handle with integral cam which mates with a non-rotating cam follower. Rotation of the handle causes displacement of the cam follower which transmits a force through a metering spring to a metering piston. The metering piston actuates a combined inlet-exhaust valve to admit or exhaust fluid pressure to its one face until the spring force on its other side is balanced. The fluid pressure at the face of the metering piston is connected to the load whose pressure it is desired to control.
A cam stop, integral with the cam follower cooperates with a matching stop on the handle to limit handle travel.
Description
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;:. Background of the Invention .
Manual 1uid pressure controllers are usea in automotive, particularly truc~ applica~ions, and in other areas where ;~
~Z manual application of metered pressur~ îs required. . ~0 . Treadle-type Eluid pressure controllers~ in which a manual linear displacement input, as from a brake treadle, meter an amount o~ ~luid pressure proportional to the linear displacement input are also used. A ~lu~d pressure controller :. adapted to operation b~ linear displ2cement is disclosed in .. U.S. Patent No. 2,450~154. H~nd ~luicl pressure controllers ~
``"' ' ' ' 1 ' ' ' . - ~, ~:
. . .
.: - . , ~ -.. . .
~ - .
-~ ' ~0 84384 are co~veniently operated by a rotary in~ut. The ~and controllers meter fluid pressure to their output in proportion to the magnitude of their angular rotation.
A fluid pressure controller suïtable for hand operation is disclosed in U.S. Patene No. 3,682,438.
Summary of the Invention The presPnt invention teaches a hand controller having an absolute minimum of p æ ts. The unitary cam-handle converts handle rotation into proportional l;near displacement of a cooperating cam piston. The linear displacement of the cam piston applies a force to o~e end of a ~pring whose other end bears against a metering piston. The metering piston has an integral exhaust valve - seat aIigned with a combined inlet-exhaust valve.
Upon being translated by rotation of the cam-handle, the integral exhaust valve of the metering pisto~ seats and seals against one surface o the inlet-exhaust valve.
This isolates the outlet from the atmosphere.
Upon slightly greater translation of the metering piston and integral exhaust valve seat, the combined inlet-exhaust valve is opened ta admit fluid pressure into a delivery chamber which connects the fluid pressure to the load. The fluid pressure in t~e delivery chamber also acts on the metering piston to oppose the spring force. When the fluid pressure on the metering piston is great enough to just overcome the spring force, the 1~8438~
~etering plston i8 transl~ted untll the lnlet-exhnust valve ag~ln closes and malntains the selected fluid pres-sure in the delivery chamber. An lncrease in the rotation of the cam handle agaln causes the inlet-exhaust valve to admit additional fluid pre~sure to the delivery chamber until a new balance is achieved. When the cam handle i8 rotated part way toward the off direction, the integral exhaust valve seat is moved out of its former sealing contact with the inlet-exhaust valve and permits some of the fluid pressure in the delivery chamber to be ex~
hausted. When the reduced fluid pressure in the delivery chamber again balances the spring force, the metering `
piston is again translated toward the inlet-exhaust `~
valve until the integral exhaust valve seat again makes sealing contact with the inlet-exhaust valve.
When the cam handle is rotated to the fully off position, the integral exhaust valve may be moved fully out of contact with the inlet-exhaust valve and, in that condition, maintains free fluid communication between ~ `~
the delivery chamber and the exhaust port.
A cam stop, integral with the cam follower limits the full-on and full-off travel of the cam handle.
In summary of the above, therefore, the present invention broadly provides a manual fluid pressure controller comprising: (a) a housing; (b) a metering piston therein for control of the applicatlon of fluid pressure in a brake system; (c) a unitary cam handle with associated cam member, the cam member being rotatably -~
mounted in the housing; (d) resilient means bearing against the metering piston at its first end; (e) a cam follower at the second end of the resilient means for cooperating A
.
3~34 wlth the cam member to npply force to the second end to actuate the metering piston for controlllng the appli-cation of the fluld pressure in the brake system, (f) means for retaining the cam member in the housing; and (g) cooperating motion limiting abutment means on the cam handle and said cam follower to limit the rotary motion of the cam handle by abutment of the cooperating motion limiting abutment means between off and on positions.
~,, Brief Description of the Drawings Fig. 1 shows an axial cross~sectional view of one embodiment of the invention.
, Fig. 2 shows an exploded partial perspective view of the controller.
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Detailed DescrLption of the~ Preferred Embodiment Referring to Fig. 1, the controller 10 is con~ained in a body 12 having a cylindrical. bore,14 therein. A base wall 16 having an axial opening 18 is located at the bo~tom of the cylindrical bore 14. A stepped counterbore 20 is axially located at the other side o~ the base wall 16.
Ths stepped counterbore 20.is threaded..at its ~uter end 2 to recei~e a pressure inlet fitting 24 sealed against - pressure leakage by gasket 26., An annular inle~ ~alve .' ~eat 28 overhangs and faces down~ard into the stepped' counterbore 20. A resilient inlet-exhaust valve 30,is normally held in sealing.contact with the inlet valve . .
: sea~ 28 by a spring 32 having negligi~le force and by '` .;' . the 1uid pressure normally connected to pressure inlet .
fitting 24. . , ;
A metering piston 34, having a sealing pisto~ ri~g ... 36 in its perimeter is located in the cylindrical bore 14 -~ -... . : , .
-- above the base wall 16 and is capable o~ axial displacemen~
.
therein. 'An axial cylindrical extension 38 extends dcwn~ard ~
- from the metering piston 34. The d;ameter of the cylindrical .;
.. 20 extension 38 is smaller than the axial opening 18 with which it is aligned. The cylindrical extension 38 and metering piston 34 contain an axial passage 40 passing axially com-pletely through them. The extremity of the cylindrical 'extension 38 forms an exhaust valve seat 42. A return spring 44 of neg'li~ible strength is biased between the base wall 16 and the metering piston 34.
The region be-~een the ~ase w~ll 16 and ~he metering piston 34 comprises a deliv~ry ch~mber 46. The delivery - chamber 46 is in open fluid communication via a channel 48 with a delivery port 50. The delivery port 50 is threaded ~r otherwise adapted to receive a pressure ~itting (not sho~n) which enables connection of the fluid pr~ssure in the delivery port 50 to the load whose fluid pressure it is desired to control.
' A'cam piston 52 having a piston ring 54 on i~s - ~0 ~perimeter is located in the cylîndrical bore 14 above the metering piston 34. A metering spring 56j having non-.
negligible strength, is biased be~een the cam piston 52 - and the metering piston 34. The exploded partial perspec- ' . tive view in Fig. ~ can also be referred to for better i understanding of the manner in which,the parts cooperate. -- The cam piston 52 contains an axial guide bore 60 and .
a helical cam ramp 62, shown dashed in Fig. 2. A cam - stop 65 extends upward from the cam piston 52. A~'least one,,~
but preferably two guide lugs 64 protrude radially outward ~ ' from the cam piston 52 and engage cooperating guide grooves 66 in the upper end of the cylindrical bore 14. The cam piston 52 is thus restrained from rotating within the cylindrical bore 14 but is enabled to axially displace within it. : -The unitary cam-handle 58 is mounted above the cam piston 52. A guide shat 68 on the unitary cam-handle 58 is guidingly itted within the axial guide bore 60. The ' cooperation between the guide shat 68 and the axial'' gUld2 b~e 60 st-ahllizes the lower end of the unitar~r ~: :
~ 8 438~
cam-handle 5S. ~ resilient seal 70 on the guide shaft 68 prevents leakage throu~h the axial guide bore 60. The perimeter 72 of a skirt 74 on lthe unitary cam-handLe 58 bears guidingly upon the cylindrical bore 14 and thereby stabilizes the upper end of the unitary cam-handle 58.
A sector 76 of the skirt 74 is omitted. ~hen assemblea, the cam stop 65 protrudes upward through the sector 76 and positively limiLs the angular exrursions of~the unit~ry cam-handle 58. A handle shaft 78~ integrally formed with the unitary cam-handle 58 extends upward from the top of the skirt 74. A handle 80 which may optionaLly be formed ~-integrally with the unitary cam-handle 58 extends generally radially * om the handle shaft 58. Optionally, a socket or other connection means may be provided on the handle shaft 78 and a separate handle 80 may be installed by any -of the methods well kno~n in the art such as, but not ,. .
limited to, swaging, screw threads, welding, adhesives bolts~ rivets or hinges.
- ~ A helical cam ramp ~2 extends downward from the skirt 74. The helical cam ramp 82 cooperates with -helical cam ramp 62 on the cam piston 52. ~ith the left-hand helices sho~n on the cam ramps 62, 82 clockwise rotation of the unitary cam-handle 58 tends to move the cam piston 52 away from the unitary cam handle 58.
Control in the opposite sense is equally possible by reversing the sense of both helices.
~ 3~3~
A circlip 84 fitted into a retaining groove 86 bears on the skirt 74 and opposes up~ard Eorces on the unitar~
cam-handle 58.
An exhaust passage 88 terminates at one end in an opening 90 into the cylindrical bore 14 between the metering piston 34 and the cam piston 52. At its other end, the exhaust passage 88 te.rminates in an exhaust port 92 which may optionally be threaded for connection `
to a fitting (not shown). . - -~0 Other configurations o~ controllert which would occur to one skilled in the art, would not depart from the spixit and scope of the present invention. For example, a unitary cam-handle 58 having two or more helical cam ramps 8~ and a matching number of helical cam ramps 62 on the cam piston 52 are contemplated by the present invention~ -.
Operation . . . . .
- . - , .
In the full-off condition shown in Fig. 1, the unitary cam-handle 58 is in its fully countercloc~ise of po5ition.
Atmospheric pressure air is freely connected between the ~ - :
. .
exhaust port 92 and the deliver~ port 50 by way of exhaust ~`
passage 88, opening 90, axial passage 40, delivery .
chamber 46 and channel 48.
When the unitary cam-handle 58 is rotated clockwise, the cam piston 52 is displaced downward into the cylindrical bore 14. A downward force is t~ansmitted through me-ering ~, .
, .
spring 56 onto me~erin~ piston 34. Metering piston 34 is displaced d~n~ard agains~ th.e negligible force oE
its return spring 44 until the exhaust valve seat 42 makes sealing contact with the inlet-exh~ust valve 30.
Fluid communication between thle exhaust port 92 and the delivery port 50 is cut off by the seal ~etween the inlet-exhaust valve 30 and the exhaust valve seat 42.
With slightly greater angular displacement of the ~ unitary cam-handle 58 in the on directio~, the orce -10 -transmitted ~rom the cam piston 52 through ~he metering .
spring 56, metering piston 34 and cylindrical ex~ension 38 is sufficient to urge the inlet-exhaust valve 30 out of ; ~ .
sealing contact with the inlet valve seat 28. Pressurized - . ~
fluid is admi~ted past inlet-exhaust valve 30 into the .
delivery chamber 46 and thence throug~ passage 48 to the . delivery port 50. The.~luid pressure in the delivery chamb-er 46 acts across the area of the metering piston 34 to develop a force in the upward direction proportional to the fluid pressure in the delivery chamber 46. The -20 pressure-derived upward force on the metering piston 34 -~
.
opposes the do~nward force applied by the metering spring -5~. At a fluid pressure in the delivery chamber 46 which is related to the angular position of the unitary cam-handle 58, the upward force on the meterlng piston 34 is - -. ~ --,}-just suEficient to compress the metering spring 56 until the inlet-exhaust valve 30 is raLised into sealing contact with inlet valve seat 28. If no other changes occur, the controller remains in the "holding" mode ~ust described in which the inle~-exhaust valve 30 remains in sealing contact with both the inlet valve seat 28 and the exhaust valve seat 42 and the desired fluid pressure is maintained in the delivery chamber 46 and the delivery port 50.
` Additional rotation of the unitary cam-handle 58 in 1~ the on direction again displaces the inlet-exhaust valve 30 out of sealing contact with the inlet valve seat 28.
Additional fluid pressure is admitted to the delivery chamber 46 until the upward pressure-derived force again overcomes the downward force from the metering spring 56 . .
The clockwise rotation o~ the unitary cam-handle 58 is positively limited by abutment of the edge of the sector 76 -.
- against the cam stop 65. ~- .
.. .. . ~ ~
When the unitary cam-handle 58 is rotated partl~
counter-clock~ise from the holding mode, the exhaust va~ve seat 42 is raised out o~ sealing contact with the inlet~
exhaust valve 3~. Fluid pressure is exhausted from the delivery chamber 46 through the axial passage 40 and exhaust passage 88. As the fluid pressure is decreased in the delivery chamber 46, the pressure-derived upward force als~ decreases. At some ineermediat~ pressure, the upward force has decreased to a val-le which allows t~.e .
metering spxing 56 to displace the exhaust valve seat 42 back into sealing contact with the inlet-exhaust val~e 30. A ne~ holding mode is entered at the new xeduced fluid pressure. ' ~ hen the unitary cam-handle 58 is rotated fully counter-clockwise to the of position, further rotation is positively limited by abutment of the edge of the sector 76 against the cam stop ~5. The exhaust valve seat 42 is raised out of sealing contact with the inlet-exhaust valve 30. The controller returns to the full-off condition shown in Fig. 1 with ~ree communication between the exhaust port 92 and the delivery port 50...... , ~ .
~ It will be'un'aerstoo'a-that'~'''the'c~a~m's`'~are~intended to '- . ' cover all changes and modifications of the preferred em~odi-ments of the invention, herein chosen for the purpose of illustration which do not constitute departures from `
the spiri~ and scope of the inv ntion.
.
-10- . .
`:
, : . . .. . . . , . ~ ~ .. . ..... ..
' . . : ~
;:. Background of the Invention .
Manual 1uid pressure controllers are usea in automotive, particularly truc~ applica~ions, and in other areas where ;~
~Z manual application of metered pressur~ îs required. . ~0 . Treadle-type Eluid pressure controllers~ in which a manual linear displacement input, as from a brake treadle, meter an amount o~ ~luid pressure proportional to the linear displacement input are also used. A ~lu~d pressure controller :. adapted to operation b~ linear displ2cement is disclosed in .. U.S. Patent No. 2,450~154. H~nd ~luicl pressure controllers ~
``"' ' ' ' 1 ' ' ' . - ~, ~:
. . .
.: - . , ~ -.. . .
~ - .
-~ ' ~0 84384 are co~veniently operated by a rotary in~ut. The ~and controllers meter fluid pressure to their output in proportion to the magnitude of their angular rotation.
A fluid pressure controller suïtable for hand operation is disclosed in U.S. Patene No. 3,682,438.
Summary of the Invention The presPnt invention teaches a hand controller having an absolute minimum of p æ ts. The unitary cam-handle converts handle rotation into proportional l;near displacement of a cooperating cam piston. The linear displacement of the cam piston applies a force to o~e end of a ~pring whose other end bears against a metering piston. The metering piston has an integral exhaust valve - seat aIigned with a combined inlet-exhaust valve.
Upon being translated by rotation of the cam-handle, the integral exhaust valve of the metering pisto~ seats and seals against one surface o the inlet-exhaust valve.
This isolates the outlet from the atmosphere.
Upon slightly greater translation of the metering piston and integral exhaust valve seat, the combined inlet-exhaust valve is opened ta admit fluid pressure into a delivery chamber which connects the fluid pressure to the load. The fluid pressure in t~e delivery chamber also acts on the metering piston to oppose the spring force. When the fluid pressure on the metering piston is great enough to just overcome the spring force, the 1~8438~
~etering plston i8 transl~ted untll the lnlet-exhnust valve ag~ln closes and malntains the selected fluid pres-sure in the delivery chamber. An lncrease in the rotation of the cam handle agaln causes the inlet-exhaust valve to admit additional fluid pre~sure to the delivery chamber until a new balance is achieved. When the cam handle i8 rotated part way toward the off direction, the integral exhaust valve seat is moved out of its former sealing contact with the inlet-exhaust valve and permits some of the fluid pressure in the delivery chamber to be ex~
hausted. When the reduced fluid pressure in the delivery chamber again balances the spring force, the metering `
piston is again translated toward the inlet-exhaust `~
valve until the integral exhaust valve seat again makes sealing contact with the inlet-exhaust valve.
When the cam handle is rotated to the fully off position, the integral exhaust valve may be moved fully out of contact with the inlet-exhaust valve and, in that condition, maintains free fluid communication between ~ `~
the delivery chamber and the exhaust port.
A cam stop, integral with the cam follower limits the full-on and full-off travel of the cam handle.
In summary of the above, therefore, the present invention broadly provides a manual fluid pressure controller comprising: (a) a housing; (b) a metering piston therein for control of the applicatlon of fluid pressure in a brake system; (c) a unitary cam handle with associated cam member, the cam member being rotatably -~
mounted in the housing; (d) resilient means bearing against the metering piston at its first end; (e) a cam follower at the second end of the resilient means for cooperating A
.
3~34 wlth the cam member to npply force to the second end to actuate the metering piston for controlllng the appli-cation of the fluld pressure in the brake system, (f) means for retaining the cam member in the housing; and (g) cooperating motion limiting abutment means on the cam handle and said cam follower to limit the rotary motion of the cam handle by abutment of the cooperating motion limiting abutment means between off and on positions.
~,, Brief Description of the Drawings Fig. 1 shows an axial cross~sectional view of one embodiment of the invention.
, Fig. 2 shows an exploded partial perspective view of the controller.
.: '' . ~, ''`"`:'`.~' ' ~
;:
~"' -, ~ .
~ -, - ' , -''.
~ 3A -A ` ~ ~
r.- - - - ... - . .. . ` I :
' !
~ 3~ ~
Detailed DescrLption of the~ Preferred Embodiment Referring to Fig. 1, the controller 10 is con~ained in a body 12 having a cylindrical. bore,14 therein. A base wall 16 having an axial opening 18 is located at the bo~tom of the cylindrical bore 14. A stepped counterbore 20 is axially located at the other side o~ the base wall 16.
Ths stepped counterbore 20.is threaded..at its ~uter end 2 to recei~e a pressure inlet fitting 24 sealed against - pressure leakage by gasket 26., An annular inle~ ~alve .' ~eat 28 overhangs and faces down~ard into the stepped' counterbore 20. A resilient inlet-exhaust valve 30,is normally held in sealing.contact with the inlet valve . .
: sea~ 28 by a spring 32 having negligi~le force and by '` .;' . the 1uid pressure normally connected to pressure inlet .
fitting 24. . , ;
A metering piston 34, having a sealing pisto~ ri~g ... 36 in its perimeter is located in the cylindrical bore 14 -~ -... . : , .
-- above the base wall 16 and is capable o~ axial displacemen~
.
therein. 'An axial cylindrical extension 38 extends dcwn~ard ~
- from the metering piston 34. The d;ameter of the cylindrical .;
.. 20 extension 38 is smaller than the axial opening 18 with which it is aligned. The cylindrical extension 38 and metering piston 34 contain an axial passage 40 passing axially com-pletely through them. The extremity of the cylindrical 'extension 38 forms an exhaust valve seat 42. A return spring 44 of neg'li~ible strength is biased between the base wall 16 and the metering piston 34.
The region be-~een the ~ase w~ll 16 and ~he metering piston 34 comprises a deliv~ry ch~mber 46. The delivery - chamber 46 is in open fluid communication via a channel 48 with a delivery port 50. The delivery port 50 is threaded ~r otherwise adapted to receive a pressure ~itting (not sho~n) which enables connection of the fluid pr~ssure in the delivery port 50 to the load whose fluid pressure it is desired to control.
' A'cam piston 52 having a piston ring 54 on i~s - ~0 ~perimeter is located in the cylîndrical bore 14 above the metering piston 34. A metering spring 56j having non-.
negligible strength, is biased be~een the cam piston 52 - and the metering piston 34. The exploded partial perspec- ' . tive view in Fig. ~ can also be referred to for better i understanding of the manner in which,the parts cooperate. -- The cam piston 52 contains an axial guide bore 60 and .
a helical cam ramp 62, shown dashed in Fig. 2. A cam - stop 65 extends upward from the cam piston 52. A~'least one,,~
but preferably two guide lugs 64 protrude radially outward ~ ' from the cam piston 52 and engage cooperating guide grooves 66 in the upper end of the cylindrical bore 14. The cam piston 52 is thus restrained from rotating within the cylindrical bore 14 but is enabled to axially displace within it. : -The unitary cam-handle 58 is mounted above the cam piston 52. A guide shat 68 on the unitary cam-handle 58 is guidingly itted within the axial guide bore 60. The ' cooperation between the guide shat 68 and the axial'' gUld2 b~e 60 st-ahllizes the lower end of the unitar~r ~: :
~ 8 438~
cam-handle 5S. ~ resilient seal 70 on the guide shaft 68 prevents leakage throu~h the axial guide bore 60. The perimeter 72 of a skirt 74 on lthe unitary cam-handLe 58 bears guidingly upon the cylindrical bore 14 and thereby stabilizes the upper end of the unitary cam-handle 58.
A sector 76 of the skirt 74 is omitted. ~hen assemblea, the cam stop 65 protrudes upward through the sector 76 and positively limiLs the angular exrursions of~the unit~ry cam-handle 58. A handle shaft 78~ integrally formed with the unitary cam-handle 58 extends upward from the top of the skirt 74. A handle 80 which may optionaLly be formed ~-integrally with the unitary cam-handle 58 extends generally radially * om the handle shaft 58. Optionally, a socket or other connection means may be provided on the handle shaft 78 and a separate handle 80 may be installed by any -of the methods well kno~n in the art such as, but not ,. .
limited to, swaging, screw threads, welding, adhesives bolts~ rivets or hinges.
- ~ A helical cam ramp ~2 extends downward from the skirt 74. The helical cam ramp 82 cooperates with -helical cam ramp 62 on the cam piston 52. ~ith the left-hand helices sho~n on the cam ramps 62, 82 clockwise rotation of the unitary cam-handle 58 tends to move the cam piston 52 away from the unitary cam handle 58.
Control in the opposite sense is equally possible by reversing the sense of both helices.
~ 3~3~
A circlip 84 fitted into a retaining groove 86 bears on the skirt 74 and opposes up~ard Eorces on the unitar~
cam-handle 58.
An exhaust passage 88 terminates at one end in an opening 90 into the cylindrical bore 14 between the metering piston 34 and the cam piston 52. At its other end, the exhaust passage 88 te.rminates in an exhaust port 92 which may optionally be threaded for connection `
to a fitting (not shown). . - -~0 Other configurations o~ controllert which would occur to one skilled in the art, would not depart from the spixit and scope of the present invention. For example, a unitary cam-handle 58 having two or more helical cam ramps 8~ and a matching number of helical cam ramps 62 on the cam piston 52 are contemplated by the present invention~ -.
Operation . . . . .
- . - , .
In the full-off condition shown in Fig. 1, the unitary cam-handle 58 is in its fully countercloc~ise of po5ition.
Atmospheric pressure air is freely connected between the ~ - :
. .
exhaust port 92 and the deliver~ port 50 by way of exhaust ~`
passage 88, opening 90, axial passage 40, delivery .
chamber 46 and channel 48.
When the unitary cam-handle 58 is rotated clockwise, the cam piston 52 is displaced downward into the cylindrical bore 14. A downward force is t~ansmitted through me-ering ~, .
, .
spring 56 onto me~erin~ piston 34. Metering piston 34 is displaced d~n~ard agains~ th.e negligible force oE
its return spring 44 until the exhaust valve seat 42 makes sealing contact with the inlet-exh~ust valve 30.
Fluid communication between thle exhaust port 92 and the delivery port 50 is cut off by the seal ~etween the inlet-exhaust valve 30 and the exhaust valve seat 42.
With slightly greater angular displacement of the ~ unitary cam-handle 58 in the on directio~, the orce -10 -transmitted ~rom the cam piston 52 through ~he metering .
spring 56, metering piston 34 and cylindrical ex~ension 38 is sufficient to urge the inlet-exhaust valve 30 out of ; ~ .
sealing contact with the inlet valve seat 28. Pressurized - . ~
fluid is admi~ted past inlet-exhaust valve 30 into the .
delivery chamber 46 and thence throug~ passage 48 to the . delivery port 50. The.~luid pressure in the delivery chamb-er 46 acts across the area of the metering piston 34 to develop a force in the upward direction proportional to the fluid pressure in the delivery chamber 46. The -20 pressure-derived upward force on the metering piston 34 -~
.
opposes the do~nward force applied by the metering spring -5~. At a fluid pressure in the delivery chamber 46 which is related to the angular position of the unitary cam-handle 58, the upward force on the meterlng piston 34 is - -. ~ --,}-just suEficient to compress the metering spring 56 until the inlet-exhaust valve 30 is raLised into sealing contact with inlet valve seat 28. If no other changes occur, the controller remains in the "holding" mode ~ust described in which the inle~-exhaust valve 30 remains in sealing contact with both the inlet valve seat 28 and the exhaust valve seat 42 and the desired fluid pressure is maintained in the delivery chamber 46 and the delivery port 50.
` Additional rotation of the unitary cam-handle 58 in 1~ the on direction again displaces the inlet-exhaust valve 30 out of sealing contact with the inlet valve seat 28.
Additional fluid pressure is admitted to the delivery chamber 46 until the upward pressure-derived force again overcomes the downward force from the metering spring 56 . .
The clockwise rotation o~ the unitary cam-handle 58 is positively limited by abutment of the edge of the sector 76 -.
- against the cam stop 65. ~- .
.. .. . ~ ~
When the unitary cam-handle 58 is rotated partl~
counter-clock~ise from the holding mode, the exhaust va~ve seat 42 is raised out o~ sealing contact with the inlet~
exhaust valve 3~. Fluid pressure is exhausted from the delivery chamber 46 through the axial passage 40 and exhaust passage 88. As the fluid pressure is decreased in the delivery chamber 46, the pressure-derived upward force als~ decreases. At some ineermediat~ pressure, the upward force has decreased to a val-le which allows t~.e .
metering spxing 56 to displace the exhaust valve seat 42 back into sealing contact with the inlet-exhaust val~e 30. A ne~ holding mode is entered at the new xeduced fluid pressure. ' ~ hen the unitary cam-handle 58 is rotated fully counter-clockwise to the of position, further rotation is positively limited by abutment of the edge of the sector 76 against the cam stop ~5. The exhaust valve seat 42 is raised out of sealing contact with the inlet-exhaust valve 30. The controller returns to the full-off condition shown in Fig. 1 with ~ree communication between the exhaust port 92 and the delivery port 50...... , ~ .
~ It will be'un'aerstoo'a-that'~'''the'c~a~m's`'~are~intended to '- . ' cover all changes and modifications of the preferred em~odi-ments of the invention, herein chosen for the purpose of illustration which do not constitute departures from `
the spiri~ and scope of the inv ntion.
.
-10- . .
Claims (7)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A manual fluid pressure controller comprising:
(a) a housing;
(b) an inlet port for connecting pressurized fluid to said housing and a delivery port in said housing;
(c) an exhaust port in said housing;
(d) a valve in said housing between said inlet and delivery ports;
(e) a cavity in said housing;
(f) a metering piston having first and second sides in said cavity;
(g) a unitary cam handle having handle and cam parts;
(h) said cam part being in said cavity and said handle part being outside said housing, said cam handle being capable of rotation between on and off positions;
(i) a cam follower in said cavity cooperating with said cam for translation substantially without rotation of said cam follower upon the occurrence of rotation of said cam handle;
(j) a spring biased between said cam follower and the first side of said metering piston;
(k) a chamber for applying the fluid pressure in said delivery port to the second side of said metering piston;
(l) a passage in said metering piston providing fluid communication between said second side and said exhaust port;
(m) an exhaust valve for sealing said passage when said cam handle is moved from its off position toward its on position;
(n) an extension on said metering piston for opening said valve whereby a metered amount of pressurized fluid is connected from said inlet port to said delivery port; and (o) cooperating motion limiting abutment means on said cam handle and said cam follower to limit the rotary motion of said cam handle by abutment of said cooperating motion limiting abutment means between off and on positions.
(a) a housing;
(b) an inlet port for connecting pressurized fluid to said housing and a delivery port in said housing;
(c) an exhaust port in said housing;
(d) a valve in said housing between said inlet and delivery ports;
(e) a cavity in said housing;
(f) a metering piston having first and second sides in said cavity;
(g) a unitary cam handle having handle and cam parts;
(h) said cam part being in said cavity and said handle part being outside said housing, said cam handle being capable of rotation between on and off positions;
(i) a cam follower in said cavity cooperating with said cam for translation substantially without rotation of said cam follower upon the occurrence of rotation of said cam handle;
(j) a spring biased between said cam follower and the first side of said metering piston;
(k) a chamber for applying the fluid pressure in said delivery port to the second side of said metering piston;
(l) a passage in said metering piston providing fluid communication between said second side and said exhaust port;
(m) an exhaust valve for sealing said passage when said cam handle is moved from its off position toward its on position;
(n) an extension on said metering piston for opening said valve whereby a metered amount of pressurized fluid is connected from said inlet port to said delivery port; and (o) cooperating motion limiting abutment means on said cam handle and said cam follower to limit the rotary motion of said cam handle by abutment of said cooperating motion limiting abutment means between off and on positions.
2. The controller recited in claim 1 wherein said abutment means includes a stop on said cam handle for interfering with a rotationally fixed motion limiting abutment on said cam follower.
3. The controller recited in claim 2 wherein said stop is an arcuate slot and said abutment is a boss en-gaging said arcuate slot.
4. The controller recited in claim 1 further comprising:
(a) said valve being an inlet-exhaust valve;
(b) said exhaust valve being an exhaust valve seat on said metering piston; and (c) said extension being effective for opening of said valve by the continued motion of said exhaust valve seat beyond the sealing position.
(a) said valve being an inlet-exhaust valve;
(b) said exhaust valve being an exhaust valve seat on said metering piston; and (c) said extension being effective for opening of said valve by the continued motion of said exhaust valve seat beyond the sealing position.
5. A manual fluid pressure controller comprising:
(a) a housing;
(b) a metering piston therein for control of the application of fluid pressure in a brake system;
(c) a cam follower positioned in said housing;
(d) resilient means biased between said cam follower and metering piston;
(e) a unitary cam handle with associated cam member, said cam member being rotatably mounted in said housing in position to cooperate with said cam follower and move said cam follower to activate the metering piston controlling the application of fluid pressure in said brake system;
(f) means for retaining said cam member in said housing;
(g) a projection on said cam follower; and (h) means on said unitary cam handle for inter-fering with said projection whereby the rotation of said cam handle is limited.
(a) a housing;
(b) a metering piston therein for control of the application of fluid pressure in a brake system;
(c) a cam follower positioned in said housing;
(d) resilient means biased between said cam follower and metering piston;
(e) a unitary cam handle with associated cam member, said cam member being rotatably mounted in said housing in position to cooperate with said cam follower and move said cam follower to activate the metering piston controlling the application of fluid pressure in said brake system;
(f) means for retaining said cam member in said housing;
(g) a projection on said cam follower; and (h) means on said unitary cam handle for inter-fering with said projection whereby the rotation of said cam handle is limited.
6. The apparatus recited in claim 5 further comprising means on said cam follower cooperating with means in said housing to prevent the rotation of said cam follower within said housing.
7. A manual fluid pressure controller comprising:
(a) a housing;
(b) a metering piston therein for control of the application of fluid pressure in a brake system;
(c) a unitary cam handle with associated cam member, said cam member being rotatably mounted in said housing;
(d) resilient means bearing against said metering piston at its first end;
(e) a cam follower at the second end of said resilient means for cooperating with said cam member to apply force to the said second end to actuate the metering piston for controlling the application of said fluid pressure in said brake system;
(f) means for retaining said cam member in said housing; and (g) cooperating motion limiting abutment means on said cam handle and said cam follower to limit the rotary motion of said cam handle by abutment of said cooperating motion limiting abutment means between off and on positions.
(a) a housing;
(b) a metering piston therein for control of the application of fluid pressure in a brake system;
(c) a unitary cam handle with associated cam member, said cam member being rotatably mounted in said housing;
(d) resilient means bearing against said metering piston at its first end;
(e) a cam follower at the second end of said resilient means for cooperating with said cam member to apply force to the said second end to actuate the metering piston for controlling the application of said fluid pressure in said brake system;
(f) means for retaining said cam member in said housing; and (g) cooperating motion limiting abutment means on said cam handle and said cam follower to limit the rotary motion of said cam handle by abutment of said cooperating motion limiting abutment means between off and on positions.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US05/804,523 US4134418A (en) | 1977-06-08 | 1977-06-08 | Manual fluid pressure controller |
| US804,523 | 1977-06-08 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1084384A true CA1084384A (en) | 1980-08-26 |
Family
ID=25189175
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA298,900A Expired CA1084384A (en) | 1977-06-08 | 1978-03-14 | Manual fluid pressure controller |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US4134418A (en) |
| CA (1) | CA1084384A (en) |
| ES (1) | ES469191A1 (en) |
| GB (1) | GB1592038A (en) |
Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4221238A (en) * | 1978-07-07 | 1980-09-09 | Forest Medical Products, Inc. | Linearly operable intermittent valve |
| US4375223A (en) * | 1979-11-05 | 1983-03-01 | Power Automotive Equipment Pty. Ltd. | Dial operated pressure regulator |
| JPS5745618A (en) * | 1980-09-01 | 1982-03-15 | Aisin Seiki Co Ltd | Negative pressure controlling valve |
| JPS57159931A (en) * | 1981-03-27 | 1982-10-02 | Aisin Seiki Co Ltd | Throttle opening response signal generator |
| US4480663A (en) * | 1982-09-13 | 1984-11-06 | Wabco Fahrzeugbremsen Gmbh | Pneumatic relay valve |
| US4606369A (en) * | 1985-07-01 | 1986-08-19 | Wabco Ltd. | Manually-operable fluid pressure regulating valve device |
| DE4016805C1 (en) * | 1990-05-25 | 1991-08-08 | Mercedes-Benz Aktiengesellschaft, 7000 Stuttgart, De | |
| US5317953A (en) * | 1992-05-26 | 1994-06-07 | Earth Tool Corporation | Neutral-centering valve control system |
| DE19806936A1 (en) * | 1998-02-19 | 1999-08-26 | Wabco Gmbh | Arrangement with a valve device |
| US7578310B2 (en) | 2006-05-11 | 2009-08-25 | Delaney Machinerie Inc. | Pressure controller device |
| USD1013164S1 (en) * | 2021-10-27 | 2024-01-30 | Shukla Medical | Surgical tool cam handle |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2087356A (en) * | 1936-05-04 | 1937-07-20 | Arthur L Parker | Valve control mechanism |
| US3031234A (en) * | 1959-08-07 | 1962-04-24 | Magneti Marelli Spa | Hand-operated pneumatic distributor for control of vehicular compressedair brakes |
| US3682438A (en) * | 1971-04-05 | 1972-08-08 | Berg Manufacturing Co | Hand control valve |
-
1977
- 1977-06-08 US US05/804,523 patent/US4134418A/en not_active Expired - Lifetime
-
1978
- 1978-03-14 CA CA298,900A patent/CA1084384A/en not_active Expired
- 1978-03-15 GB GB10174/78A patent/GB1592038A/en not_active Expired
- 1978-04-26 ES ES469191A patent/ES469191A1/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| GB1592038A (en) | 1981-07-01 |
| ES469191A1 (en) | 1979-01-16 |
| US4134418A (en) | 1979-01-16 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |